EP4105172B1 - Anti-caking composition of sodium chlorate - Google Patents

Anti-caking composition of sodium chlorate Download PDF

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Publication number
EP4105172B1
EP4105172B1 EP21180471.1A EP21180471A EP4105172B1 EP 4105172 B1 EP4105172 B1 EP 4105172B1 EP 21180471 A EP21180471 A EP 21180471A EP 4105172 B1 EP4105172 B1 EP 4105172B1
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EP
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Prior art keywords
weight
caking agent
sodium chlorate
powder composition
sodium
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EP21180471.1A
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German (de)
English (en)
French (fr)
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EP4105172A1 (en
Inventor
Johan Lif
Kimona Häggström
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Nouryon Chemicals International BV
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Nouryon Chemicals International BV
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Priority to EP21180471.1A priority Critical patent/EP4105172B1/en
Priority to FIEP21180471.1T priority patent/FI4105172T3/fi
Priority to CA3162426A priority patent/CA3162426C/en
Priority to CN202210660909.4A priority patent/CN115490209B/zh
Priority to BR102022011597-4A priority patent/BR102022011597A2/pt
Priority to US17/807,388 priority patent/US20220402758A1/en
Publication of EP4105172A1 publication Critical patent/EP4105172A1/en
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Publication of EP4105172B1 publication Critical patent/EP4105172B1/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
    • C01B11/12—Chloric acid
    • C01B11/14—Chlorates
    • C01B11/145—Separation; Crystallisation; Purification, After-treatment; Stabilisation by additives
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
    • C01B11/12—Chloric acid
    • C01B11/14—Chlorates

Definitions

  • the present invention relates to anti-caking compositions of sodium chlorate comprising as an anti-caking agent anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the present invention further relates to a method of packaging a powder composition comprising sodium chlorate and to the use of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as an anti-caking agent in a package containing a powder composition comprising sodium chlorate.
  • Sodium chlorate is a commonly known compound which is widely used for the generation of chlorine dioxide required in particular for the bleaching of pulp.
  • One important advantage of sodium chlorate is that it is a safe transportable source of chlorine dioxide from which the chloride dioxide, being a toxic and corrosive gas, can be generated just on the bleaching site in the amounts as required. Processes for generating chlorine dioxide from sodium chlorate are for instance described in the review article " Manufacture of Chlorine Dioxide from Sodium Chlorate: State of the Art" of B. R. Deshwal and H. K. Lee (J. Ind. Eng. Chem., Vol. 11, No. 3 (2005) 330-346 ). Another common application of sodium chlorate is in herbicidal compositions.
  • caking of sodium chlorate may occur over time, for instance during storage under humid conditions or delayed transportation, such as for more than 40 days.
  • various anti-caking additives have been proposed for adding to the sodium chlorate.
  • Known anti-caking agents are for instance calcium chloride, silica, quicklime, sodium hydroxide, magnesium oxide, magnesium carbonate and magnesium hydroxide.
  • surfactants as anticaking agents in sodium chlorate (for example suggested by CN106757134 , CN1319559 and CN108560014 ).
  • addition of organic compounds to sodium chlorate is highly undesirable from a safety perspective.
  • GB 1291916 A describes herbicidal composition
  • an alkali metal chlorate such as sodium chlorate
  • calcium chloride prevents caking during storage.
  • calcium chloride has the disadvantage that the calcium and the sulphate from the sulphuric acid used in the process to generate the chlorine dioxide form calcium sulphate. The calcium sulfate will precipitate and produce a scaling which may block pipes, valves, etc. of the chlorine dioxide process equipment.
  • GB 1422666 A discloses a process for producing a herbicidal composition not liable to explode and comprising at least one alkali metal or alkaline earth metal chlorate, at least one residual organic herbicide, at least 2% of inert antilumping filler and from 4 to 20% of water.
  • the antilumping filler i.e. an anti-caking additive, is described to be for instance silica.
  • GB 1460446 A discloses a weed killer composition comprising from 40 to 70% of a chlorate salt, such as potassium or sodium chlorate, from 15 to 60% of urea and inter alia an anti-caking agent such as silica or inorganic silicates.
  • silica or silicates have the disadvantage that it tends to foam the reactor solution in the chlorine dioxide generator. Such foaming may result in undesirable decomposition of chlorine dioxide which may even pose a safety hazard.
  • GB 617778 A describes a method of drying basic chlorate and mixing it with a small proportion of quicklime to prevent agglomeration.
  • the obtained composition may be used as a weed killer or converted into pure chlorate by suspension in water and removal of precipitated lime.
  • quicklime or lime contain calcium ions and - as already set forth above - these calcium ions form undesirable scaling in the presence of sulphate ions from the sulphuric acid which is commonly used for generation of chlorine dioxide.
  • JPS 4330177 proposes to prevent the caking of dry sodium chlorate by adding 0.2-0.5% sodium hydroxide (powder with 97% purity) and thorough mixing of the obtained composition.
  • sodium hydroxide in the process of generating chlorine dioxide from sodium chlorate is undesirable in view of overall process efficiency.
  • the required thorough mixing is time-consuming and produces costs.
  • BE 645093 discloses alkali metal chlorate powders and teaches that the addition of 0.5-2% of fine grained amorphous silica to sodium chlorate or other alkali metal chlorate powders confers better anti-caking properties than the commonly used magnesium oxide, magnesium hydroxide or magnesium carbonate.
  • the powders are used as weed eradicators, in the printing industry, as oxidizing agents, and in general for chemical manufacture.
  • the presence of magnesium ions in a process of producing chlorine dioxide has similar disadvantages as the presence of calcium ions, i.e. precipitates may form (magnesium sulphate) which may clog the equipment used.
  • GB 451894 suggests the use of at least 5 % by weight of non-oxidizing compounds of an alkali or alkaline earth metal to reduce the fire hazard and in the examples of GB 451894 even 6:4 mixtures of sodium chlorate and sodium carbonate are used.
  • GB 860651 even suggests using 48 to 54 % by weight sodium carbonate compared to 17.5 to 21 % by weight of sodium chlorate, i.e.
  • FR 2862957 suggests the use of at least one hydrogen carbonate of an alkali or alkaline earth metal, for example sodium hydrogen carbonate, in amounts of at least 5 weight% to reduce the oxidizing power of sodium chlorate and thereby facilitate its transportation. It is further disclosed that the hydrogen carbonate should be separated from the sodium chlorate before using the sodium chlorate to generate chlorine dioxide. However, such additional separation step is not desirable from a cost and environmental perspective.
  • a package comprising from 97.0 to 99.7 weight% of sodium chlorate and from 0.3 to 2.0 weight% of an anti-caking agent; wherein the anti-caking agent is anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the present invention further relates to a method of packaging a powder composition comprising sodium chlorate, the method comprising the steps of providing a container and adding to the container from 97.0 to 99.7 weight% sodium chlorate and from 0.3 to 2.0 weight% of an anti-caking agent, wherein the anti-caking agent is anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the present invention further relates to the use of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as an anti-caking agent in a package containing a powder composition comprising at least 97.0 weight% sodium chlorate.
  • the present invention provides a package containing a powder composition comprising from 97.0 to 99.7 weight% of sodium chlorate and from 0.3 to 2.0 weight% of an anti-caking agent; wherein the anti-caking agent is anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the powder composition in such a package which contains anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing in very low amounts of 2 weight% or less provides anti-caking properties of the powder composition. Rather, it has surprisingly been found that such powder compositions do not cake even when stored for 150 days.
  • the package may be any container suitable for containing, transporting and/or storing sodium chlorate, such as for instance bags made from polymeric material such as polypropylene, wherein the polymeric material may be in a woven structure, plastic containers, such as for instance made from polyethylene or any other suitable polymer, or metal containers, such as for instance made from aluminum or any suitable metal alloy.
  • the package for instance bags from polymeric materials, in particular if having a woven structure, may further contain a liner, such as a liner of polyethylene or any other suitable polymeric material.
  • the powder composition contained in the package comprises from 97.0 to 99.7 weight%, preferably from 98.0 to 99.7 wcight%, more preferably from 98.2 weight% to 99.7 weight%, even more preferably from 98.5 to 99. weight% and most preferably from 99.0 to 99.7 weight% of sodium chlorate (NaClO 3 ). These amount ranges may be based on the dry weight of the sodium chlorate. In other words, these amount ranges exclude any water potentially present in trace amounts in the sodium chlorate.
  • the powder composition contained in the package further comprises from 0.3 to 2.0 weight%, preferably from 0.3 to 1.5 weight%, more preferably from 0.3 to 1.0 % weight% and even more preferably from 0.5 to 0.9 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as anticaking agent. These amount ranges may be based on the dry weight of the powder composition.
  • the package of the present invention contains a powder composition comprising from 98.0 to 99.7 weight% of sodium chlorate and from 0.3 to 2.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the package of the present invention contains a powder composition comprising from 98.2 to 99.7 weight% of sodium chlorate and from 0.3 to 1.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the package of the present invention contains a powder composition comprising from 99.0 to 99.7 weight% of sodium chlorate and from 0.3 to 1.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • a powder composition comprising from 99.0 to 99.7 weight% of sodium chlorate and from 0.3 to 1.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the amount of all components comprised in the compositions add up to 100 weight% and refers to weight percentage of the total weight of the powder composition.
  • the anti-caking agent is anhydrous sodium carbonate (Na 2 CO 3 ), anhydrous sodium hydrogen carbonate (NaHCO 3 ), sodium carbonate monohydrate (Na 2 CO 3 ⁇ H 2 O) or a mixture of any of the foregoing.
  • Anhydrous means that the sodium carbonate or the sodium hydrogen carbonate is essentially free of any water.
  • Anhydrous sodium carbonate may be formed by heating hydrate(s) of the sodium carbonate.
  • hydrate forms of sodium carbonate are sodium carbonate decahydrate (Na 2 CO 3 ⁇ 10 H 2 O), sodium carbonate heptahydrate (Na 2 CO 3 ⁇ 7 H 2 O) and sodium carbonate monohydrate (Na 2 CO 3 ⁇ H 2 O).
  • Sodium carbonate monohydrate is the monohydrate form of sodium carbonate.
  • the water molecule in this compound is also called crystal water.
  • the anti-caking agents anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate and sodium carbonate monohydrate can be used alone or in any combination of two or more thereof in any ratio. If for example, a mixture of any two of the anti-caking agents is used, the ratio of the two anti-caking agents can be such as from 1/99 to 99/1 or from 10/90 to 90/10 or from 20/80 to 80/20 or from 30/70 to 70/30. Also 50/50 mixtures are possible.
  • any ratio of anhydrous sodium carbonate to anhydrous sodium hydrogen carbonate can be used such as from 1/99 to 99/1 or from 10/90 to 90/10 or from 20/80 to 80/20 or from 30/70 to 70/30.
  • mixtures of all three anti-caking agents in any ratio of the components are suitable.
  • the anti-caking agent may be anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate or a mixture thereof. In other embodiments, the anti-caking agent may be anhydrous sodium carbonate, sodium carbonate monohydrate or a mixture thereof. In a particularly preferred embodiment, the anti-caking agent is anhydrous sodium carbonate.
  • the powder composition may further comprise up to 1.5 weight%, preferably up to 1.0 weight%, more preferably up to 0.7 weight%, even more preferably up to 0.5 weight%, and most preferably of up to 0.4 weight% of water and/or other inorganic compounds.
  • the other inorganic compounds are any inorganic compounds other than sodium chlorate, anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate and sodium carbonate monohydrate.
  • the other inorganic compounds may be compounds which are commonly considered as impurities such as chlorides, chlorites and perchlorates or metals and alkali metals, such as for instance chrome, potassium and iron.
  • the other inorganic compound may also be any suitable additional functional additives.
  • the powder composition may be essentially free of any organic material, such as organic surfactants, solvent residues, etc. Powder composition which are devoid of such organic material are safer due to reduced risk for foaming, fire and explosion.
  • the powder composition may comprise up to 0.5 weight%, preferably up to 0.4 weight%, more preferably up to 0.3 weight% and even more preferably up to 0.2 weight% or even only up to 0.1% of water.
  • the powder composition may comprise up to 0.5 weight%, preferably up to 0.4 weight%, more preferably up to 0.3 weight% and even more preferably up to 0.2 weight% of other inorganic compounds.
  • the powder composition may comprise up to 0.5 weight% of water and up to 0.5 weight% of other inorganic compounds.
  • the powder composition contained in the package consists of from 97.0 to 99.7 weight% of sodium chlorate, from 0.3 to 2.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as anti-caking agent, and from 0 to 1.75 weight%, preferably from 0 to 1.0 weight%, more preferably from 0 to 0.7 weight% and even more preferably from 0 to 0.5 weight% of water and/or other inorganic compounds, wherein the total amount of sodium chlorate, the anti-caking agent, water and the other inorganic compounds sums up to 100 weight%.
  • the powder composition contained in the package consists of from 98.0 to 99.7 weight% of sodium chlorate, from 0.3 to 2.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing, from 0 to 0.5 weight% of water and from 0 to 0.75 weight% of other inorganic compounds, wherein the total amount of sodium chlorate, the anti-caking agent, water and the other inorganic compounds sums up to 100 weight%.
  • the powder composition contained in the package consists of from 98.5 to 99.7 weight% of sodium chlorate based on the dry weight of the powder composition, from 0.3 to 1.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as anti-caking agent based on the dry weight of the powder composition and from 0 to 0.5 weight% of other inorganic compounds based on the dry weight of the powder composition, wherein the total amount of sodium chlorate, the anti-caking agent, and the other inorganic compounds sums up to 100 weight%.
  • the powder composition contained in the package consists of from 98.5 to 99.7 weight% of sodium chlorate based on the dry weight of the powder composition, from 0.3 to 1.0 weight% of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate or a mixture thereof as anti-caking agent based on the dry weight of the powder composition and from 0 to 0.5 weight% of other inorganic compounds based on the dry weight of the powder composition, wherein the total amount of sodium chlorate, the anti-caking agent, and the other inorganic compounds sums up to 100 weight%.
  • the powder composition contained in the package consists of from 98.5 to 99.7 weight% of sodium chlorate based on the dry weight of the powder composition, from 0.3 to 1.0 weight% of anhydrous sodium carbonate as anti-caking agent based on the dry weight of the powder composition and from 0 to 0.5 weight% of other inorganic compounds based on the dry weight of the powder composition, wherein the total amount of sodium chlorate, the anti-caking agent, and the other inorganic compounds sums up to 100 weight%.
  • the package may contain the powder composition in principle in any form, i.e. in the form of a homogenous or heterogenous mixture.
  • the package contains the powder composition in the form of a heterogenous mixture comprising two or more phases, for instance three or more phases or five or more phases or even more than 10 phases. More particularly, the package contains the powder composition as heterogenous mixture comprising from two to ten different phases, particularly from two to four different phases.
  • the heterogenous mixture comprising the two or more phases comprises a first phase comprising ⁇ 50 weight% sodium chlorate and a second phase comprising > 50 weight% of the anti-caking agent.
  • the first phase essentially consists of sodium chlorate and the second phase essentially consists of the anti-caking agent.
  • the powder composition as described herein has not necessarily to be contained in the package. Rather, the above described structural features, properties and preferred embodiments of the powder composition also equally apply to a powder composition as such.
  • the anti-caking agent i.e. the anhydrous sodium carbonate, the anhydrous sodium hydrogen carbonate, the sodium carbonate monohydrate or a mixture of any of the foregoing, can be added on the top or at the bottom of sodium chlorate in the package or somewhere in the middle of the sodium chlorate, i.e. as a middle layer.
  • the anti-caking agent may also be added on the bottom and on the top of the sodium chlorate or at the top, middle and bottom of the package.
  • the anti-caking additive may be added as a type of layer.
  • the term "layer" means that a discrete portion of the anti-caking agent is in direct surface contact with a discrete portion of the sodium chlorate. This means that for instance only part of the total amount of sodium chlorate may be covered with the anti-caking agent. In other words, it is for instance not necessary that the whole top surface of the sodium chlorate necessarily has to be covered with the anticaking agent.
  • the advantage of a heterogenous mixture is that it can be prepared much easier than a homogeneous mixture by just separately adding the components into the package.
  • the present invention further provides a method of packaging a powder composition comprising sodium chlorate, the method comprising the steps of providing a container and adding to the container from 97.0 to 99.7 weight% sodium chlorate and from 0.3 to 2.0 weight% of an anti-caking agent, wherein the anti-caking agent is anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing.
  • the powder composition and the components thereof as well as the amount ranges of the components may be as described above in the context of the package according to the invention.
  • the container may be any means suitable for packaging, transporting and/or storing sodium chlorate, such as a bag.
  • the container may be any package as described above.
  • the addition of the components of the powder composition into the container is not particularly limited and any suitable order of adding the components can be employed.
  • the sodium chlorate and the anti-caking agent may be added simultaneously or stepwise and the components may or may not be mixed after their addition into the container.
  • the components may also be mixed before being added into the container.
  • the components may be added stepwise without substantial mixing thereby forming a heterogenous mixture comprising two or more phases, wherein a first phase comprises ⁇ 50 weight% sodium chlorate and a second phase comprises ⁇ 50 weight% of the anti-caking agent.
  • the first phase essentially consists of sodium chlorate and the second phase essentially consists of the anti-caking agent.
  • the anti-caking agent may be added first into the container, followed by the addition of the sodium chlorate or, alternatively, the sodium chlorate may be added first into the container, followed by the addition of the anti-caking agent. It is also possible to add in alternating addition steps more than one portion of the sodium chlorate and/or the anti-caking agent without substantial mixing. For instance, in one embodiment, in a five-step addition protocol a portion of the anti-caking agent is added first into the container, followed by the addition of sodium chlorate, then a further portion of anti-caking agent is added, followed by the addition of a further portion of sodium chlorate and, finally, an even further portion of the anti-caking agent is added.
  • the different portions of sodium chlorate and anti-caking agent may have different sizes, i.e. it is not necessary that always exactly the same absolute amounts of the components have to be added. Rather, in case more than one portion of the anti-caking agent and/or the sodium chlorate is added, the amounts of the individual portions of the components may be adjusted according to needs. In principle, any multi-step addition protocol can be employed. However, in view of procedural efficacy, it is preferred to not perform in total more than ten, preferably not more than eight separate addition steps.
  • the desirable anti-caking properties of the anti-caking agent can also be achieved in case of a stepwise addition of sodium chlorate and the anti-caking agent, i.e. anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing, without any substantial mixing of the components.
  • the at least two phases may also be combined so to form a layered structure comprising at least one first layer of the first phase and at least one layer of the second phase.
  • the layered structure may comprise in total more than two layers of the first layer and/or the second layer, wherein at least two layers are of the same type of layer, i.e. wherein at least two layers are either of the type of the first layer or of the type of the second layer.
  • the present invention further relates to the use of anhydrous sodium carbonate, anhydrous sodium hydrogen carbonate, sodium carbonate monohydrate or a mixture of any of the foregoing as an anti-caking agent in a package containing a powder composition comprising at least 97.0 weight%, preferably at least 98.0 weight%, more preferably at least 98.2 weight%, even more preferably at least 98.5 weight% and most preferably at least 99.0 weight% sodium chlorate.
  • the amount of anti-caking agent may be as described above in the context of the package of the present invention.
  • Each package was prepared according to the following seven-step addition protocol by first filling about 2.5 kg of anhydrous sodium carbonate into a 1 m 3 big bag made of woven polypropylene with a liner of polyethylene. About 417 kg of freshly prepared sodium chlorate ( ⁇ 0.2 weight% water) was thereafter added into the bag containing the sodium carbonate. Then about 2.5 kg of additional anhydrous sodium carbonate followed by about 417 kg of freshly prepared sodium chlorate, a second addition of 2.5 kg of additional anhydrous sodium carbonate followed by about 417 kg of freshly prepared sodium chlorate and finally about 2.5 kg of additional anhydrous sodium carbonate were added into the bag. In total 10 kg of sodium carbonate were added to 1250 kg sodium chlorate.
  • the three packages were stored for 150 days in a dry storage room ventilated versus outdoor conditions, i.e. at about 25 °C and about 80 % humidity on average.
  • Each package was prepared by filling about 1250 kg freshly prepared commercial sodium chlorate ( ⁇ 0.2 weight% water) into a 1 m 3 big bag made of woven polypropylene with a liner of polyethylene. The three packages were stored for 150 days at the same conditions as the packages of Example 1.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
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  • Pest Control & Pesticides (AREA)
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  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
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EP21180471.1A 2021-06-18 2021-06-18 Anti-caking composition of sodium chlorate Active EP4105172B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP21180471.1A EP4105172B1 (en) 2021-06-18 2021-06-18 Anti-caking composition of sodium chlorate
FIEP21180471.1T FI4105172T3 (fi) 2021-06-18 2021-06-18 Natriumkloraatin paakkuuntumisenestokoostumus patenttivaatimukset
CA3162426A CA3162426C (en) 2021-06-18 2022-06-09 Anti-caking composition of sodium chlorate
CN202210660909.4A CN115490209B (zh) 2021-06-18 2022-06-13 氯酸钠的防结块组合物
BR102022011597-4A BR102022011597A2 (pt) 2021-06-18 2022-06-13 Embalagem contendo uma composição em pó, método de empacotamento de uma composição em pó, e uso de carbonato de sódio anidro, carbonato de hidrogênio de sódio anidro, carbonato de sódio monoidratado ou uma mistura de qualquer um dos anteriores
US17/807,388 US20220402758A1 (en) 2021-06-18 2022-06-17 Anti-caking composition of sodium chlorate

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EP21180471.1A EP4105172B1 (en) 2021-06-18 2021-06-18 Anti-caking composition of sodium chlorate

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EP4105172A1 EP4105172A1 (en) 2022-12-21
EP4105172B1 true EP4105172B1 (en) 2024-04-03

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CN (1) CN115490209B (zh)
BR (1) BR102022011597A2 (zh)
CA (1) CA3162426C (zh)
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Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE645093A (zh)
GB451894A (en) 1935-05-08 1936-08-13 Stockholms Superfosfat Fab Ab Method for the treatment of chlorates for the purpose of reducing the risk of fire
GB617778A (en) 1944-12-20 1949-02-11 Solvay Process of manufacturing basic calcium chlorate and basic calcium chloride from solutions containing both calcium chlorate and chloride
GB860651A (en) 1958-09-01 1961-02-08 Newlands Bros And Mumford Ltd An improved bleaching composition
BE735898A (zh) 1969-07-10 1969-12-16
OA04417A (fr) 1972-06-13 1980-02-29 Dev Et La Vente Des Specialite Composition désherbante à base d'un chlorate alcalin.
GB1460446A (en) 1973-02-09 1977-01-06 Atlas Products Services Ltd Weedkiller compositions
CN1196646C (zh) 2001-02-13 2005-04-13 福州一化化学品有限公司 氯酸钠晶体防结块性能的改进方法
FR2862957B1 (fr) 2003-11-28 2006-12-01 Quadrimex Composition comprenant du chlorate de sodium, nac103, ainsi que des compositions la contenant
CN106757134A (zh) 2015-11-25 2017-05-31 湖南恒光化工有限公司 一种防结块氯酸钠的生产工艺
JP6671777B2 (ja) * 2016-02-16 2020-03-25 カーリットホールディングス株式会社 除草剤組成物
JPWO2018105485A1 (ja) * 2016-12-05 2019-10-24 株式会社カネカ 次亜塩素酸ナトリウム５水和物結晶粉体、その製造方法及びそれを用いた次亜塩素酸ナトリウムの水溶液
CN108560014A (zh) 2018-05-24 2018-09-21 汶川县湘宁氯酸盐有限责任公司 一种氯酸钠的制备方法
CN110558318A (zh) * 2019-09-19 2019-12-13 河南省化工研究所有限责任公司 一种稳定型二氧化氯泡腾剂及其制备方法

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CA3162426A1 (en) 2022-12-18
CA3162426C (en) 2024-05-28
BR102022011597A2 (pt) 2023-10-03
CN115490209B (zh) 2024-04-16
FI4105172T3 (fi) 2024-05-16
CN115490209A (zh) 2022-12-20

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